linux-kernel - Re: [PATCH 11/12] IPMI: Fix BT long busy

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Date:	Sun, 3 Dec 2006 13:26:36 -0800
From:	Andrew Morton <akpm@...l.org>
To:	minyard@....org
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	OpenIPMI Developers <openipmi-developer@...ts.sourceforge.net>,
	Rocky Craig <rocky.craig@...com>
Subject: Re: [PATCH 11/12] IPMI: Fix BT long busy

On Fri, 1 Dec 2006 22:39:21 -0600
Corey Minyard <minyard@....org> wrote:

> 
> The IPMI BT subdriver has been patched to survive "long busy"
> timeouts seen during firmware upgrades and resets.  The patch
> never returns the HOSED state, synthesizes response messages with
> meaningful completion codes, and recovers gracefully when the
> hardware finishes the long busy.  The subdriver now issues a "Get BT
> Capabilities" command and properly uses those results.
> More informative completion codes are returned on error from
> transaction starts; this logic was propogated to the KCS and
> SMIC subdrivers.  Finally, indent and other style quirks were
> normalized.
> 
> ...
>
> +	BT_CONTROL(BT_CLR_WR_PTR);	/* always reset */

argh.

#define BT_STATUS	bt->io->inputb(bt->io, 0)
#define BT_CONTROL(x)	bt->io->outputb(bt->io, 0, x)

#define BMC2HOST	bt->io->inputb(bt->io, 1)
#define HOST2BMC(x)	bt->io->outputb(bt->io, 1, x)

#define BT_INTMASK_R	bt->io->inputb(bt->io, 2)
#define BT_INTMASK_W(x)	bt->io->outputb(bt->io, 2, x)

Please don't write macros which require that the caller have a particular
local variable of a particular name.

In fact, please don't write macros.

All the above would be perfectly nice as

static inline void bt_control(struct si_sm_data *bt, int val)
{
	bt->io->outputb(bt->io, val);
}


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